Boring tool



Sept. 1, 1931.

3 Sheets-Sheet 1 Filed Dec. 5, 1927' 4 4 2 W/ 7 /k/ /////////?///M////// Amy n U 4 3 7 7//////////k//// 7 7/ p z' 15" to provide means'. for. carrying ;ap'ar'of t a ters in addition-to'those carrie'jdjbythereamera arms. Otherobject s are ;m mvdea very;

` much simplifiedarrang i l ving also the? Patented Sept. l, 1931 UNITED STATES amr rr. 'or ommovr, nwmmm ustam:: -'ro SULLIVAJN e y mmm: co rrmr, A canzone-.rron or gmsscmsr'ra nome TOOL a patin mea December i This inyentionrelates to borin tools of the .expanding reamer 'type and is irected ar- `ticularly to improvementsover an ex an ing 'reamer forming thesubject matter 'o mycopending application Ser.. No. 65,019, filed .Oct. 26, 1925. It isparticularlyi adapted foruse in enlarginga drilled ho lfeto provide 'a larger,

- space `for explosives', 'althougi s` 3 it I willi -be .understood that it maybe employed in other 10 useswhere anexpandng reamer islne'ded 'It is an object of the presentinventionfto :provide improved means forefiecting' opera-i tion oofthe expansion mechanismofor the expanding reamer arms, A further `bject is' Fig. 9 is an elevation showing the outer `rved surface ofoneof the sliding jaw memrs, Fig. 10 is a transverse sectional View on the "li ne 10- -1O 'of Fig. 4. e 1 Fig. 11 is a rspective view of the longipivoted reamer arms. Figs. 12fiand 13 are transverse sectional views of the sli'ding jaw member on lines 12-12an'd 13-'13V,respective1y, of Fig. 9. Fig. 14 is a transverse sectional view on the .line 14-'14 of Fig. 8. v 15 is also-a transverse section through iding-jaw on the line 15-45 of Fig. 9.

Fig.; 16' is a fra mentary elevational view thelower end o the casing. In'the illustrative embodiment of my inadvantages 'of' -i idityf nd, lower eost 'of vfitiongl have shown a casing 1 extending ao manufactire than the me dislosed 'in e myy pp o e e fr S l hf 'objectsand 'advantages wiil'hereinafter more fully appean; In the accoinpanying drawin'gs there-is shown for purposes offillustrationone form which the'inventon may 'assume n practice.

i In' thes e-drawings,- I 1 Fig. l' is 'an elevational View of theboring h the 'reamer arms in contracted posi- AEig; 2 is a similar view showing the reamer arms'just afterthey have been moved to expandng position.

- :Fig. 3 isalsoianelevational view of the bor- `"ing-tooiin a drilled hole showing the same in the operation ,of deepening and enlarging the Fig.'4`i a vertical' sectional view of the bor- 4 ing tool'showing the :reamer arms in contractthe reamer.` arms in eipanded position.

.fiomjthe sirface of the ground into a drilled hleziwhich has been previously drilled by some suitable apparatus. The casing 1, as ;appears in Fig. 8, carries on its end a threaded` chuck 3 for cooperation with internalthreads on the casing 4 of my improved exi Pending reamer. It will be understood that anysuita'ble type of chuck may be employed as the connection between the casings 1 and 4.' The chuck 3 is hollow to provide for the passage of cleansing fluid downwardly therethrough.

. My improved expanding reamer mechanism comprises generally a pair of sliding jaws' 5 and 6 secured together at each end .as by bolts 7 and 8 to form a substantially cylindrical unit adapted to telescopically fit into the bore of the casing 4. Slots 9 and 10 are formed in the siiding jaw members 'to receive a key 11 secured to the casing'4 to allow a limited amount of telescop'ing movement between the sliding jaw members and the outer. casing. The key 11 has mounted thereon a c lindrical hearing member 12 to receive a p urality of reamer arms' 14 and '15 which .are adapted to pivot on the member 12 in moving from the collapsed position indicated in Fig. 4 to the expanded position of Fig. 5. The sliding jaw members are spaced apart a suflicient distance toallow the pvoted reamer arms to be received between "tu dinal key an bearing Construction for the' 'their fiat surfaces are placed together the slots 16 and 17 will extend in opposite directions. y i v The operation of the mechanism thus far described will be readily apparent. ,When

the casing carryin the reamer mechanism is inserted in a drlled hole, the cutters 21 carried b the sliding jaws will strike the bottom o the hole and the casing carrying the key 11 and bearing member 12 will continue to move downwardly whereby the reamer carrying arms will be moved relative to the sliding jaw members, and this relative movement through the action of the lugs 18 and' 19 working in the opposed cam grooves 16 and 17 respectively will cause the reamer arms to move in a scissor-like fashion to the full expanded position shown in Fig. 2. Thereafter the casing carrying the four cutters as one unit will continue to rotate and be fed dqwnwardly, thereby deepening and enlarging the bottom of the hole as illustrated in Fig. 3. I

A coiled spring 22 inserted between the chuck 3 and the sliding jaw members normally forces the jaw members into the position illustrated in Fig. 4, whereby the expanding reamers are held in the collapsed position while being inserted in the hole. The bottom end of the casing 4 is suitably notched as at 23, 24 to allow for the Swinging movement of the pivoted reamer arms. It will also be noted that these reamer arms are formed with shoulders 25 and 26 adapted to seat against the bottom of the recesses 23 and 24. upon the surfaces 27 and 28 respectively. Each of the sliding jaw members is provided with suitable recesses 29 and 30 to receive the cutters 20 in'theircollapsed position and throughout their range of movement. In order to provide a better hearing between the casing and the reaming cutters to take the stress of rotation, I have provided a plurality of keys 31 and 32, as best shown in Fig.u8, Secured to the'casing by any suitable means such as i'lvets 33. The

- outer surfaces of the jaw` members are provided with keyways 34 and 35 to accommoda-te the keys throughout their range of movement.

These keys are also provided with openings 36 and 37 to receive the ends of the transverse key 11 and thus aid in transmitting the load on the bearing member 12 to the drill easing.

The sliding jaw members are each provided with means for conducting cleansing fluid from the drill casing to a point ad'acent the cutters 21 carried by the sliding aw members. For this purpose the upper end of each of these jaw members is provided witha plurality of lon itudinally extending slots 38, as best shown in Figs. 9 and 12. These slots terminate at points39 and 40 adjacent the recesses 29 and 30, which recesses provide adequate means for condueting the cleansing fluid to a point adjacent the hearing member 12, from which point the fluid is conducted through a plurality of holcs 41 and 42 opening just above the cutters 21 at points 43, 44, respectively. It will thus be readily a' parent that adequate means is provided or conducting'a cleansing fluid such as air or water under pressure through the drill casing and expanding mechanism for the reamer arm to the extreme bottom of the hole where it will be most efl'ective;

The cutters 20 and 21 as illustrated are of a usual conical rotary type generally known in the trade as the'Hughes cutter, but it will be understood thatany suitable type of cutter may be employed with my improved expanding reamer. One ofthese cutters is illustrated in section in Fi 8 and as will be apparent is mounted on a earing 45 which may be integral with -or otherwise secured to the` sliding jaw member. r

It will now be apparent that I have provided a very simple arrangement for effecting theexpansion of a reamer and one which is very rigid and not liable to get out of order easily; also that the cost of manufacture has been materially reduced.

While I have in this application specifically described one' form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be-modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. An earth cutting tool comprising a casing, a unit mounted in the end thereof for linited telescopic movement, a cutter carried by said unit, a plurality of pivoted arms arranged in side by side relaton'to swing about a common axis and cutters carried thereby, means secured to said casing to provide a relatively fixed bearing for said arms, and means carried by said unit adapted to actuate said arms pivotally about said bearing upon telescopic movement between said unit and said casing.

2. In an earth cutting tool, a casing, a member of generally cylindrical form mounted in the end .of said casing for limited telescopic movement, means forming a vertically extending slot in said member, an expanding reamer mechanism having a plurality of reamer carrying arms mounted in ovcrlapping relation in said slot, means carried by said casing to provide a relatively fixed bearng for said arms, and cam mechanism comcarried thereby, p ing through [said i cured-in said'casin prising grooves formed in said telescoping member and cooperating projections carried by said arms. I

,3. In an earth cutting tool, a casing, a plurality of cut-ter carrying arms carried thereby, a bearing member on which said arms are pivotally mounted and means for pvotally :actuating said arms-aboutsaid bearng comprising an abutmentmember 'movable relative 'to "saidcasing and cam mechanism* transverse'key xenda member "and seg tool', a`casng-,- a unit 4. "In an earth cittin telescopcally ,mounted tr'ansverjse' key bearm' member s r nd n e mttng rotarymove cured to sadl casng adapted to ooperate with longitudinal rejc esj'sesin said telescopng 5. An earthcuttin'g t` comprising a casing, a unit mounted inth'e endthereof for limited telescopic movement', said unit comprising a pluralitv offsliding jaws and cutters carried thereby, a' plurality of pivoted arms mounted' between said `jaws, a cutter carried by each of said arms, means Secured to sad casng to provide a bearng for sad i arms, and means carried by said unit adapted to actuate said pivoted arms upon telescopic movement between sad unit and sad casng.

6. An earth cutting tool comprising a casing, a plurality of sliding aw members mounted in said casing for lmted telescopic movement, said jaw members having opposed recesses to 'provide a vertieally extending slot therebetween, a pluarlity of pivoted arms arranged in overla ping relation in said slot, a cutter ca-rrie by each of said arms, means Secured to said casing to provide a bearing for said arms, and means carried by said unit adaptedto actuate said pivoted arms upon telescopic movement between sad unit and casing.` e

7. An earth cutting tool comprising a casing, aunit mounted in the end thereof for limited telescopic movement, a plurality of cutters carried by said unit, a plurality of` reamer arms pivotally mounted in said casing arranged in side'by side relation to swing about a common axis on a relatively fixed pivot', and meanscarried by said unit adapted to actua-te said -arms about said pivot upon telescopiee movement between said unit and said casing, said means comprising cam mechanism carried by said unit and pivoted arms. p

8. An earth cutting tool comprising a casing, an abutment member mounted therein for limited telescopic movement, a plutheren -andgc arrying V vable-a cutters ortfor fsadlast means g r trans- I said hearing .member and secure Qed in the endof sad casing for limited teleseopicmovment, means forming a vertica-lly ext-ending recess in said member, an expanding reamer mechanism having a lurality of reamer carrying arms mounte in overlapping relation in said recess, a key extending transversely of and Secured in said casing, a bearing for said arms mounted on said key, said member having elongated slots `therein through which said key extends, and means carried by said member adapted toactuate said pivoted arms upon movement of said member relatively to said casng.

10. In an eartheutting tool, a; casing, a plurality of sliding jaws mounted therein for limited telescopc movement, a plurality of pivoted arms mounted between said jaws,

means comprising a transverse key Secured in said casing and a bearing member mounted thereon to pivotally connect said arms to said easing, each of said sliding jaws havin an elongated slot therein through whic said key extends so as to permit limited relative movement between said jaws and key,

cam mechanism carried by said sliding jaws and pivoted arms foractuatin the latter upon movement of said sliding aws.

11. In an earth cutting tool, a casing, a plurality of cutter carryng arms pivotally mounted in said casing, means for expanding said a-rms comprising a bearing member se- I cured in said casing, means for pivotally actuating said arms about said member comprising an abutment member movable relative to said casing, cam mechanism carried thereby, a transverse key extendin through in sad casing, and means on said abutment member cooperating with said key for limiting relative longitudinal movement.

12. In an earth cutting tool, a casng, a member mounted therein for limited lon itudinal movement, transversely 'mova le 'cutters pivotally connected to' sa-d casing, a

support for said cutters comprising a transverse key Secured in said casng and a bearing member surrounding said key, and means for transmitting rotary movement -between said casing and cutters through said member comprising means engaging said casing and sliding member to permit longitudinal relative movement but prevent relative rotary movement.

I 13. In an earth cutt ing tool, a casing, a.

'sq ing, a plurality of slidin pnra-lity ofslidin jaws mounted ther-ein for nted relative ongitudinal movement, a pair of transversely movable cutters pvotally mounted between said 'aws 'in sh a 5 manner thattorque may transmtted :from said jaws to said cutters, a support for said last named cutterscomprising a transverse key Secured in said casing, a bearing member mounted on said key, means for ren sisting relative rotary 'movement between said jaws and said casing' comprising a longi- V tudinally' extending key carried by one of the same and cooperating with a groove in the other, and means for actuating said trans I versely movable cutters to expanded position upon relative movement between said jaws and casing. 14. In an earth cuttingtool comprisin a oasing, a unit mounted in the end thereof or aq limited telescopie movement, a cutting element carried by said unit, expandng reamer arms carried b said casing on a relatively fixed pivot, an cam meohanism carried by' said'unit and said arms for actuating the 25, latter, and yielding means -for normally pro- 4 i j ecting said unit to its forward limit of movement and holding said. reamer mechanism in contracted position.

` 15. An earth cutting tool comprising a casjaw members mounted in said casing for re ative longitudinal movement, earth cutting means carried by said sliding jaws, a plurality of reamer carr ing arms pivotally mounted on a relative y fixed pivot in said casing, means carried by said sliding jaws for 'actuating said arms to expaded position upon relative longitudinal movement between said slidin jaws and cas-' ing in one direction, and yiel ing means for normally ur ing said sliding jaws in the opposite direction and maintaining said pivoted arms in contracted position.

16. An earth cutting tool comprising a cas-' ing, a plurality of sliding jaw members mounted in said oasing for relative longitudinal movement,-earth cutting means carried anism carried by said unit and said arms for actuating the latter, and yie'ldin'g means' tor normally projecting said unit'to its forward limit of movement and holding said reamer; mechanism in contract ed position.

18. An earth cutting tool gom'prising a eas ing, a plurality of sliding zjaw*menbe mounted in said casing for relative'lon'gitidi i in arms pivotally moun casing, means carried by said slidin` actuatng sad arms to expande upon relative longitudinal movement said sliding'jaws and casing in'one direction and yielding means for normall urgingsaid sliding jaws in the opposite. irection 'and maintaining said pivoted' arms in contrac ted.

position. I w

19. An earth cutting tool com'prisingLa-;cas g mounte in said easingor relative long'iturli-f nal movement, earth cutting means carried by said sliding jaws, a plurality of 'reamer lurality f Sliding befs carrying arms pivotall g mounted" andfar ranged m side by side re ationon a relatively' fixed pivot to Swing about-a common axis :in

said using, m n ar diby said lidin' es* jarmsito ,ex nd a jaws for actuating sai position upon; Tekti 'gtudinal movement of 'sa-id slidi'ngja s inwiar y of saicl v.

. i u nt casng, and a compressfn sp -ng m said casing for proje'ctingi 'd lidingjavvs outwardly from ;said 'as n 'reby 'said reamer arms areheld-` In testimony whereof lraflixgm signature; u Ensar H. RCER,

" no i by said sli'ding jaws, a plurality of reamer carrying arms pivotally mounted on a relatively fixed pivot in said easing, means carriedby said sliding jaws for actuating said arms to expanded position upon relative longitudinal movement of said sliding jaws inwardly of said casing, and a compression spring mounted in said easing for projecting said sliding jaws outwardly from said easing whereby said reamer arms are held in contracted position while being inserted in a drilled hole. y

17.. In an earth cutting tool comprising a* casing, a unit mounted in the end thereof for limited telescopio movement, a cutting ele- I ment carried by said unit, expanding reamer infeontraeted position 'while beinginserte'd in a'drilledholel i -L maj 

